Process for the preparation of cationic resins, aqueous, dispersions, thereof, and electrodeposition using the aqueous dispersions
AssigneePPG Industries, Inc.
InventorsMarco Wismer, Joseph F. Bosso
Life of this patent
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Abstract
An improved process for the preparation of cationic resins derived from polyepoxides is disclosed. Typically, the process comprises contacting the polyepoxide with particular polyether polyols and heating the two together to form a resin which may then be reacted with a cationic base group former such as an amine and acid. Aqueous dispersions of the cationic resins prepared by the improved process are useful for coating applications, particularly cationic electrodeposition. They exhibit good low temperature cure response and the cured coatings have good physical properties such as resistance to water, detergent and salt spray corrosion.
Claims14
In a process for preparing a resin which contains cationic base groups comprising reacting a polyepoxide resin with a cationic base group former and dispersing the resulting cationic resin in aqueous medium, the improvement comprising:
- contacting a polyepoxide with a polyether polyol and heating the two together to form the polyepoxide resin, said polyether polyol formed from reacting:
- (A) a cyclic polyol with
- (B) ethylene oxide or a mixture of ethylene oxide and an alkylene oxide having 3 to 8 carbon atoms in the alkylene chain;
- the equivalent ratio of (B) to (A) being within the range of 3 to 20:1.
Dependencies are inferred from the claim text.